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Re: question about localization rig

Hi Stefan,

I used for our 24 speaker ring the MOTU 24 I/O audio interface, which feed into two 12-channel 50W-power amps (Knoll, Canada GS12- They are 110V! Now replaced by KES600 coming apparently also as 240V version:
http://www.knollsystems.com/prod-amp-kes600.htm ). 
Canton Plus XS.2 are small concentric 2-way speaker (~£100 a pair). The multicore cable "Speakerflex 250/8", which connect from the power amps to two breakout boxes, helps to make the installation look tidy (sourced from Connectronics, UK).

Best wishes,

Torsten Marquardt
Lecturer in Auditory Biophysics
UCL Ear Institute
University College London
332 Gray's Inn Rd., London WC1X8EE, UK

-----Original Message-----
From: AUDITORY - Research in Auditory Perception [mailto:AUDITORY@xxxxxxxxxxxxxxx] On Behalf Of Stefan Bleeck
Sent: 02 July 2012 14:18
To: AUDITORY@xxxxxxxxxxxxxxx
Subject: [AUDITORY] question about localization rig

Dear learned colleagues
We are replacing our old psychophysics sound localization rig that is regularly used in research and education (typical example: MSc project on sound localization ability when wearing hearing aids). We would like to have a good resolution and the ability to play sounds via any number of channels simultaneously.
I am asking for your opinion about the following two options (Both are about the same price and have 24 channels (up to 16 bit and 100 kHz).

National Instruments
is controlled via data acquisition toolbox and connected to PC via express card (for flexibility, though can use PCI card as well as or instead of).

Tucker Davies:
TD is controlled using MATLAB via ActiveX and connected to PC via PCI card. Both options require us to sort out amplification, though TD would be delighted to sell us three 8-channel amps totalling £1.5k.

Can you recommend one on the basis of your experience?


Dr. Stefan Bleeck
Hearing and Balance Centre
Institute of Sound and Vibration Research Faculty of Engineering and the Environment University of Southampton, SO17 1BJ, UK Room 4093, Tizard building (13) bleeck@xxxxxxxxx Tel.: 02380 596682